That's a really elegant solution to the ruggedness problem. If it weren't for USB-C and a bigger battery that I want I would definitely go down your route. Doing the full transplant is very time consuming and the risk of killing the donor bangle is considerable.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
That's a really elegant solution to the ruggedness problem. If it weren't for USB-C and a bigger battery that I want I would definitely go down your route. Doing the full transplant is very time consuming and the risk of killing the donor bangle is considerable.